单项选择题

（）is known to the world, Mark Twain is a great American writer.

A、 As
B、 That
C、 Who
D、 Which

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单项选择题
It is high time someone（）Nick that each member of a team has to do his share of work.

A、 could tell
B、 tell
C、 told
D、 would tell
单项选择题
We found it impossible（）all the questions within the time given.

A、 solve
B、 being solving
C、 to have solved
D、 to solve
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